feat(gui): breaking changes - Timer Task Management

1. we add menu actions 'manual' and 'about', so
you can click actions to open manual and about dialog.
2. we introduce timer task management feature, so
you can add, delete timer tasks to auto run task.
3. other style improvement in gui...

src/gui/ALConfigWidget.ui

@@ -1829,6 +1829,9 @@
             <property name="text">
              <string>导出配置文件</string>
             </property>
+            <property name="icon">
+             <iconset theme="document-save"/>
+            </property>
            </widget>
           </item>
          </layout>
@@ -1924,6 +1927,9 @@
        <property name="text">
         <string>新建配置</string>
        </property>
+       <property name="icon">
+        <iconset theme="document-new"/>
+       </property>
       </widget>
      </item>
      <item>
@@ -1943,6 +1949,9 @@
        <property name="text">
         <string>加载配置</string>
        </property>
+       <property name="icon">
+        <iconset theme="document-open"/>
+       </property>
       </widget>
      </item>
      <item>